syzbot


BUG: corrupted list in p9_conn_cancel (2)

Status: auto-obsoleted due to no activity on 2023/05/08 23:23
Subsystems: v9fs
[Documentation on labels]
Reported-by: syzbot+bd63242d8c12fc9f8f35@syzkaller.appspotmail.com
First crash: 385d, last: 385d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: corrupted list in p9_conn_cancel (3) v9fs 1 195d 191d 0/26 auto-obsoleted due to no activity on 2023/11/14 18:11
linux-4.14 BUG: corrupted list in p9_conn_cancel syz error 5 1361d 1611d 0/1 upstream: reported syz repro on 2019/10/01 03:22
upstream BUG: corrupted list in p9_conn_cancel v9fs C done 18 1959d 2059d 13/26 fixed on 2019/11/11 16:48

Sample crash report:
list_del corruption, ffff88807c443c70->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6065 Comm: kworker/1:9 Not tainted 6.2.0-rc7-syzkaller-00013-g513c1a3d3f19 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events p9_read_work
RIP: 0010:__list_del_entry_valid.cold+0x5c/0x72 lib/list_debug.c:53
Code: e8 50 17 f0 ff 0f 0b 48 89 ee 48 c7 c7 a0 9c a6 8a e8 3f 17 f0 ff 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 60 9d a6 8a e8 2b 17 f0 ff <0f> 0b 4c 89 e9 48 89 ee 48 c7 c7 a0 9e a6 8a e8 17 17 f0 ff 0f 0b
RSP: 0018:ffffc900048a7b58 EFLAGS: 00010282
RAX: 000000000000004e RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888078c9c280 RSI: ffffffff8165314c RDI: fffff52000914f5d
RBP: ffff88807c443c70 R08: 000000000000004e R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dead000000000122
R13: dead000000000100 R14: ffff88807c443c70 R15: 1ffff11010ce1f04
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020404030 CR3: 000000002edc2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 p9_conn_cancel+0x6a2/0x920 net/9p/trans_fd.c:215
 p9_read_work+0x516/0x1050 net/9p/trans_fd.c:407
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x669/0x1090 kernel/workqueue.c:2436
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid.cold+0x5c/0x72 lib/list_debug.c:53
Code: e8 50 17 f0 ff 0f 0b 48 89 ee 48 c7 c7 a0 9c a6 8a e8 3f 17 f0 ff 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 60 9d a6 8a e8 2b 17 f0 ff <0f> 0b 4c 89 e9 48 89 ee 48 c7 c7 a0 9e a6 8a e8 17 17 f0 ff 0f 0b
RSP: 0018:ffffc900048a7b58 EFLAGS: 00010282
RAX: 000000000000004e RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888078c9c280 RSI: ffffffff8165314c RDI: fffff52000914f5d
RBP: ffff88807c443c70 R08: 000000000000004e R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: dead000000000122
R13: dead000000000100 R14: ffff88807c443c70 R15: 1ffff11010ce1f04
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca7f28c920 CR3: 0000000079b2d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/07 23:22 upstream 513c1a3d3f19 15c3d445 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root BUG: corrupted list in p9_conn_cancel
* Struck through repros no longer work on HEAD.